Lobed buffing wheel

ABSTRACT

The invention relates to the machining of materials and can be used for removing flaws from various surfaces, particularly from housings, sheets and cast parts, as well as for removing coatings and rust. A lobed buffing wheel comprises lobes of a buffing material that includes an abrasive material on an elastic substrate, said lobes being fastened to a drive shaft. The lobes of buffing material are created from flat geometric shapes that are bent with the abrasive material facing outward to form a three-dimensional shape, and are fastened to the drive shaft by the bent fastening side. This provides for more efficient buffing of complex-shaped parts by increasing the area of contact between the buffing surfaces and the part.

This nonprovisional application is a continuation of International Application No. PCT/RU2021/000534, which was filed on Dec. 1, 2021, and which claims priority to Russian Patent Application No. 2020140806, which was filed in Russia on Dec. 10, 2020, and which are both herein incorporated by reference.

FIELD OF THE INVENTION

The invention relates to grinding lobe wheels containing lobes of grinding material, including an abrasive material on an elastic substrate, fixed with one side on the drive shaft. The invention can be used for grinding, removing defects from various surfaces, for example, from body parts, sheets, and castings, as well as for removing coatings and rust. Nozzles with fine abrasive are suitable for finishing metals, wood, and other materials, including polishing.

BACKGROUND OF THE INVENTION

There are known devices representing a grinding petal wheel containing petals of grinding material, including an abrasive material on an elastic substrate, fixed with one side—the fixing side—on the drive shaft.

Thus, from the patent for utility model No. 137226, published on 10 Feb. 2014, a grinding petal wheel is known with the formation of petals having one or more grooves located on the sides of the petals facing the hub, as well as the placement in these grooves of reinforcing (metal, plastic, fabric) rings oriented coaxially with the wheel and fixed in the grooves by filling with an adhesive composition based on synthetic or organic binders. The grooves of the petals can be made rectangular, T-shaped, or otherwise shaped. Also, due to the increased penetration area of the adhesive composition between the petals, the utility model allows you to increase the width of the grinding wheel without compromising its strength, as well as to operate the wheel in more severe grinding conditions (temperature, pressure load of the wheel to the treated surface, etc.). The wheel of the proposed design is supposed to be used by planting it on the shaft with the help of a landing gear provided on the wheel holes and fixing it in various ways that exclude turning the wheel on the shaft.

So, from the patent for invention No. 92006241, published on Mar. 27, 1995, the petal polishing wheel is known, consisting of clamping flanges with annular grooves, petals, and connecting bolts. In addition, it has a one-piece petal block, in which lateral annular grooves are spaced from the base and have a depth of at least 0.1 of the width of the wheel, the surface of its base (holes), shoulder pads and grooves are covered with an environmentally friendly, viscous and durable adhesive, for example, a PVA glue-based dressing, 1.0-2.0 mm thick, which is applied with penetration to the entire thickness of the petals and to 2-3 mm into the interstitial gaps, and the flanges are made of a material neutral to the coating material, for example, poly amide 406, and are equipped with locking pins, while the width of the petals and the height of the shoulder pads in them are 5-10% larger than the corresponding reciprocal places in the flanges.

From the patent for the invention of the Russian Federation No. 2171739, publication date 10 Aug. 2001, a petal wheel is known, containing abrasive petals impaled on a wire body with a landing hole and a slot. Discs and mounting elements are used to position the petals. A slot is made on each of the petals sequentially, with alternating sides. On the disks, in the areas of their contact with the petals, corrugations are made.

This device is the closest in technical essence and the achieved technical result and was chosen for the prototype of the proposed invention.

The disadvantage of this prototype and other analogs is the presence of only one working surface of the wheel, the lack of uniform grinding of corners and parts of complex shape due to high axial rigidity, high material consumption, namely the need to use a large number of lobes to give the nozzle a permanent shape, glue for a strong connection of lobes and additional parts, which inevitably leads to an increase in the complexity of the assembly.

SUMMARY OF THE INVENTION

Based on this original observation, the present invention mainly aims to offer the lobed buffing wheel containing lobes of a grinding material including an abrasive material on an elastic substrate, fixed with one of its sides—the fixing side—on the drive shaft, allowing leastwise to smooth out at least one of the above disadvantages, and it is to ensure an improvement in the efficiency of grinding parts of complex shape by increasing the area of contact of the grinding surfaces with the part, which is the task.

To achieve this goal, the lobes of the grinding material are made of flat geometric shapes, bent outward by the abrasive material to form a three-dimensional shape, and fixed to the drive shaft with the bent side of the attachment.

Thanks to these advantageous characteristics, it becomes possible to increase the area of contact of the grinding surfaces with the part, which leads to an improvement in the efficiency of grinding parts of complex shapes.

There is a preferred version of this device, in which the lobes of the grinding material are made of flat geometric shapes having an axis of symmetry perpendicular to the fixing side, bent outward by the abrasive material along the axis of symmetry to form a three-dimensional figure and fixed to the drive shaft by the fixing side bent in half.

Thanks to these advantageous characteristics, it becomes possible to reduce the load on the drive shaft, and, consequently, on the drive device due to the uniformity of the distribution of the rotating mass and reducing the stiffness of the connection between the lobes and the part.

There is another version of this device, in which the lobes of the grinding material are placed evenly on the drive shaft with partial overlap.

Thanks to these advantageous characteristics, it becomes possible to improve the quality of the surface to be cleaned, as well as reduce the load on the shaft due to the uniformity of the distribution of the rotating mass and reduce the stiffness of the connection between the lobes and the part.

There is also a variant of this device, in which the lobes of the grinding material are fixed to the drive shaft with washers and nuts.

Thanks to these advantageous characteristics, it becomes possible to fix the lobes of the grinding material in specifics and ease of their replacement.

The totality of the essential features of the proposed invention is unknown from the prior art for methods of a similar purpose, which allows us to conclude that the criterion of “novelty” corresponds to the invention in respect to the method. In addition, this solution is not obvious to a specialist in this field.

SHORT DESCRIPTION OF DRAWINGS

Other distinctive features and advantages of this invention clearly follow from the description given below for illustration and are not restrictive, with links to the attached drawings, in which:

FIG. 1 depicts the frontal view of the lobed buffing wheel, according to the invention,

FIG. 2 shows a side view of the lobed buffing wheel, according to the invention, part of the lobes is not shown,

FIGS. 3 and 4 represent examples of the shape of the lobes, according to the invention,

FIG. 5 depicts the appearance of the lobed huffing wheel, according to the invention.

FIGS. 1-5 reference:

-   -   1—the lobes of the grinding material     -   2—screw-drive shaft     -   3—the first pressure washer     -   4—support washer     -   5—second pressure washer     -   6—nut     -   7—axis of symmetry

Invisible lines are represented by dashed lines.

DETAILED DESCRIPTION

According to FIGS. 1-5 , the lobed buffing wheel contains the lobes of grinding material 1, including an abrasive material on an elastic substrate, fixed with one side—the fixing side—on the drive shaft 2. The lobes of the grinding material 1 are made of flat geometric shapes, bent outward by the abrasive material to form a three-dimensional figure and fixed to the drive shaft 2 by the bent fixing side.

Predominantly, the lobes of the grinding material 2 are made of flat geometric shapes having an axis of symmetry 7 perpendicular to the fixing side, bent outward by the abrasive material along the axis of symmetry 7 to form a three-dimensional figure and fixed to the drive shaft by the fixing side bent in half.

The lobes of grinding material 1 may be placed evenly on the drive shaft 2 with partial overlap.

The lobes of the grinding material 1 may be fixed to the drive shaft 2 with washers and nuts.

DESCRIPTION OF THE EMBODIMENTS

The lobed buffing wheel works as follows: when the wheel is rotated using the drive shaft 2 (FIG. 1 ) or the shaft of an angle grinder, or a machine and in contact with the processed surface of any kind and shape, the lobes of the grinding material 1 are elastically deformed by pressing, thereby repeating the shape of the part. At the same time, if planes intersect at an angle from the surface, the wheel is able to grind both planes evenly at once. The wheel is restrained from destruction by the compression of the lobes with washers 3, 4, and 5, the compression force is provided by the threaded screw-drive shaft 2 and nuts 6.

INDUSTRIAL APPLICABILITY

The proposed lobed buffing wheel can be carried out by a specialist in practice and, when implemented, ensure the implementation of the claimed purpose, which allows us to conclude that the criterion of “industrial applicability” for the invention meets.

According to the proposed invention, a prototype of the lobed buffing wheel was made, in which the lobes of the grinding material are evenly distributed with partial overlap and fixed to the drive shaft with washers pressing the symmetrically bent lobes to the support washer.

Tests of the prototype have shown that it provides the ability to grind parts of complex shapes as efficiently as possible.

Thus, in this invention, the task has been achieved—to improve the efficiency of grinding parts of complex shapes by increasing the area of contact of the grinding surfaces with the part.

That is, an increase in the quality of surface treatment is achieved while reducing the work input of grinding and reducing the material consumption and labor costs of manufacturing the device.

Other advantages of this device are the simplicity of the design, the absence of plastic deformation even with a small number of lobes due to their shape and elasticity, the possibility to grind corners and surfaces of complex configuration without changing the geometric parameters of the part, the presence of three surfaces suitable for grinding at once, the absence of shock loads on the drive shaft. That is, with the simplicity of the design and even with a relatively small number of lobes, it becomes possible to grind parts from various materials of complex shapes without changing their geometric parameters effectively. Moreover, the symmetrical arrangement of the lobes of the grinding material with the minimum required pressure of the huffing wheel on the part leads to the absence of shock loads on the drive shaft. 

1. A lobed buffing wheel containing lobes of a grinding material, the wheel comprising: an abrasive material on an elastic substrate, fixed on one side by a fixing side—on the drive shaft, wherein the lobes of the grinding material are made of flat geometric shapes, bent outward by the abrasive material to form a three-dimensional shape and fixed to the drive shaft by the bent fixing side.
 2. The lobed buffing wheel according to claim 1, wherein the lobes of the grinding material are made of flat geometric shapes having an axis of symmetry perpendicular to the fixing side, bent outward by the abrasive material along the axis of symmetry to form a three-dimensional figure and fixed to the drive shaft by the fixing side bent in half.
 3. The lobed buffing wheel according to claim 1, wherein the lobes of the grinding material are placed evenly on the drive shaft with partial overlap.
 4. The lobed buffing wheel according to claim 1, wherein the lobes of the grinding material are fixed to the drive shaft with washers and nuts. 